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Tire

a technology of tires and treads, applied in the direction of tyre tread bands/patterns, vehicle components, transportation and packaging, etc., can solve the problems of small stones a large number of small stones are trapped in some grooves, and remain for a long tim

Active Publication Date: 2022-06-28
SUMITOMO RUBBER IND LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent aims to provide a tire that can prevent stone-biting for a long time. This is achieved by improving the tire's tread design, including the addition of lateral grooves and blocks that are connected by a first projected portion including a tie-bar and a narrow rib-portion. These features help to distribute the tire's load and reduce damage to the tire caused by stones and other debris.

Problems solved by technology

When such a tire rolls on unpaved gravel roads, there has been the problem that one or more small stones are trapped in some grooves and remain for a long term (hereinafter, referred to as “stone-biting”).
Thus, stone-biting causes cracks on the bottoms of the grooves.
Unfortunately, since the above-mentioned projections are configured such that the projections tend to bend down in the groove width direction, there has been a new problem that some small stones are trapped in a gap between the projection and one of groove walls.

Method used

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Examples

Experimental program
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Effect test

example

[0068]Tires with the tread pattern as shown in FIG. 1 were manufactured by way of trial based on the specification in Table 1, and then on-snow performance and stone-biting resistance thereof were tested. The common specification and the testing method of the test tires are as follows. Note that FIGS. 5A and 5B show the respective shoulder lateral grooves in accordance with comparative examples 1 and 2 (Ref. 1 and Ref. 2).

Narrow rib-portion axial length Le / shoulder block maximum width WB=37%

Tie-bar portion height h2 of second projected portion / height h1 of first projected portion=95%

Tie-bar portion width Wt of second projected portion / shoulder blocks maximum width WB=12%

On-Snow Performance Test:

[0069]Each set of test tires was mounted onto a four-wheel drive vehicle having a displacement of 3600 cc as the all wheels under the following conditions:

[0070]rim size: 17×8.0 J; and

[0071]inner pressure: 240 kPa (all wheels).

[0072]Then, a test driver drove the test vehicle on a test course ...

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Abstract

A tire includes a tread portion provided with lateral grooves extending in a tire axial direction and blocks divided by the lateral grooves. At least one of the lateral grooves is provided with a first projected portion with a bottom protruding from a groove bottom of the at least one of the lateral grooves. The first projected portion includes at least one tie-bar portion connecting a pair of blocks with each other which is arranged adjacently through the at least one of the lateral groove, and a narrow rib-portion extending in a longitudinal direction of the at least one of the lateral groove from the at least one tie-bar portion without being connected to the pair of blocks.

Description

BACKGROUND ARTField of the Invention[0001]The present invention relates to tires, and more particularly to a tire including a tread portion provided with lateral grooves and blocks.Description of the Related Art[0002]Generally, tire treads are provided with circumferential grooves, lateral grooves, and blocks divided by these grooves. When such a tire rolls on unpaved gravel roads, there has been the problem that one or more small stones are trapped in some grooves and remain for a long term (hereinafter, referred to as “stone-biting”). Further, the trapped small stones tend to push the grooves repeatedly in such a manner as to expand the groove widths during running, and eventually some stones reach the bottoms of grooves. Thus, stone-biting causes cracks on the bottoms of the grooves.[0003]Conventionally, in order to avoid stone-biting, the following Patent Literatures 1 and 2 propose providing small width projections which protrude locally from the bottoms of grooves.[0004]Unfort...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B60C11/03B60C11/04B60C11/11B60C11/13B60C11/12
CPCB60C11/0309B60C11/04B60C11/11B60C11/1369B60C11/12B60C2011/0397B60C2011/1361B60C11/03B60C11/042B60C11/047B60C2011/0358
Inventor HOSHINO, TAKAFUMIMEGURO, YUYA
Owner SUMITOMO RUBBER IND LTD
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